Welcome to the forum! You don't mention the year of your rig. If it isn't a late 2018 or a 2019 you should look at past posts on AC for the PVC pipe fix and other ideas to get better air flow. If it's hot where you normally go and you've done the other fixes you may want to go to a 3rd AC unit like we did. As to the Camping World you are using. If you aren't happy with the results call Keystone Customer Service and request whom else they would recommend in your area.
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
2017 3500 Dodge Maxi DRW 4X4, Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, etc.